/***************************************************************************
 * Copyright 2012-2013 TXT e-solutions SpA
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * This work was performed within the IoT_at_Work Project
 * and partially funded by the European Commission's
 * 7th Framework Programme under the contract ICT-257367.
 *
 * Authors:
 *      Salvatore Piccione (TXT e-solutions SpA)
 *
 * Contributors:
 *        Domenico Rotondi (TXT e-solutions SpA)
 **************************************************************************/
package it.txt.ens.client.subscriber;

import it.txt.ens.client.core.ENSEvent;


/**
 * This interface defines a method for receiving the events consumed by the
 * {@linkplain ENSSubscriber} object this listener is registered with.
 * 
 * @author Salvatore Piccione (TXT e-solutions SpA - salvatore.piccione AT txtgroup.com)
 * @author Domenico Rotondi (TXT e-solutions SpA - domenico.rotondi AT txtgroup.com)
 * @see ENSSubscriber
 */
public interface ENSEventListener {
    
    /**
     * Performs an action on the given event.<br/>We strongly recommend that implementations of
     * this method <b>do not perform intensive tasks</b> on the same thread because the event consumption
     * is blocked until the execution of <code>onEvent( ENSEvent )</code> for each registered event listener 
     * ends.
     * 
     * @param event the event to be processed
     */
    public void onEvent (ENSEvent event);

}
